Vibratory relay



Nun 259 E924 S. R. SMH'H VIBRATORY RELAY Filed oct. 1s. 1920 ssheets-shew 1 S. R. SMITH VIBRTORY RELAY 3 Sheng-me?, 2

Filed oct. 1s, 1920- FGM Nov. 25, 1924. www@ S. R. SMITH VIBRATORY RELAYFiled oct. 18, 1520 sheets-sheen Patented Nov. 25, 1924.-.

Lainate SIDNEY REYNELL SMITH, O1? LONDON, ENG-LAND, ASSGNOR T0 AUTOMATICTELE- PHONE MANUFACTURNG COMPANY LIMITED, GF L'VERPOO'L, ENGLAND.

VBRATORY RELAY.

Application led october 18, 1920.

T all whom t may concer/t:

Be it known that SIDNEY RnYNn-nn SMrrH, a subject of the King of GreatBritain, residing at 14 Leigham Vale, Streatham, Loin don, lS. `W. 16,England, has invented cerw tain new and useful Improvement in VibratoryRelays (for which l have in part iiled an application in England,January 1T, 1919, Patent No. 138,966), of which the fol lowing is aspecification.

The present invention has for its object an arrangement for indicatingor utilizing minute vibrator-y movements of a size incapable of givingeither a visual indication or of operating an electrical contact.

Such vibratory movements are, for instance, obtained on a telephonereceiver and are at the most not greater than .001, and usuallyconsiderably less.

According to the present invention this object is effected byconnectingthe niember, which is subject to vibratory movement of thenature referred to, directly to a movable member so as to exert agreater frictional force along the surface thereof when moving in onedirection than when moving in the other, so that the movable member isthereb.,Y given a movement in one direction only.

Such a connection preferably consists of a fine thread of wire catgutsilk or the like wound partially around the surface 'of a pivotedcylindrical member and connected at its other end to a spring.

By connecting to the movable member a suitable contact making device arelay is obtained, while by a suitable arrangement the movable membermay be arranged to give a visual indication.

It has been found that without any magnification whatever of thevibration the drum will rotate at a speed snfiicient to give therequired visual indication or to effect the opening or closing of anelectrical circuit, and it is believed that this construction is thefirst to make use of such minute vibrations for this purpose.

Another feature of the present invention is an indicator or relayoperated by vibratory movements of the type described and adapted toremain operated until reset.

Another feature of the present invention is a translating deviceoperated by vibratory movements of the type described and adapted torespond suificiently rapidly to the pres- Seiial] No. 417,839.

ence or absence of movement, so that, for instance signals of highfrequency current in Morse code may be converted into ordinary directcurrent signals capable of operating a sounder in the usual way.

liet a fourth feature of the present invention is a relay adapted to beoperated in response to the vibratory movements and to be deenergizedwhen the vibratory movements cease, so that, for instance, the ringingof a bell may be directly under the control of the calling party.

By way of example, a description willrbe given of modilications of theparent invention adapted to perform the above functions although it willbe understood that modiiications can be readily made in theconstructional details by those versed in the art without departing fromthe spirit of the invention.

Referring to the accompanying drawings, Figure 1 illustrates a sectionalelevation on the line 1 1 of Figure 2, of an indicator or circuitclosing device adapted to respond to vibratory currents and requiring`to be manually reset, while Figure 2 shows a plan view. Figure 3 showsan arrangement in which the features of operating` a bell or operatingthe sounder are incorporated in a single instrument while Figure 4 showsan elevation of the devicewhich responds to the vibrations. Fig. 5 is anenlarged view of part of Fig. 1, while Fig. 6 is a cross-section on theline 6-6 of Fig. 5 and shows the method of supporting the armature, thismethod not being new and forming no part of the present invention; it isbriefly described herein merely in order that the operation of thevibrator may be understood.

Referring now to Figures 1 and 2, it will be seen that one end of thereed 1 is secured to a thread 5 of catgut or the like which passes roundcylindrical drum 6 pivoted at 'T and 8 and secured by means of themilled head rod 10. The other end of the reed 1 is limited in its motionby springs 11- and 12 adapted to be adjusted respectively by the screws13 and 1li, so as to avoidthe reed contacting with the pole pieces.Thereed 1 forms the armature of an electro magnet and is supportedinside the former 100 as shown in Fig. 6 by means of the wire 101 so asto operate between the pole pieces 2- and 3 of the permanent magnet 4:.There is an elongated slot, as shown at 102. in

Figs. 5 and 6, on the ripper side of the former, which enables the wire101 to be. threaded through the holes shown in the lower side ot' the`t'ormer and the armature when the armature is held in position showninside the former, the ends being bent along the former as sharply aspossible. The wire is then soldered as shown at 103 and 104 both to thearmature and. to the tormer when the temporary supports may be removed,and it will be found that the armature is then supported solely by 'unewire 101 in a neutral position between the pole pieces 2 and 3, to whichneutral position it always tends to return on deflection due to strainsbeing set up in the wire, as will be appreciated.

Pivoted at the rear ot the device and extending' forwardly are the armsl5 and lo, carrying an indicator plate 1T. fr rod 18 pivoted betweenthese arms and carries a member 19 normally restingon the. surtaxer ofthe cylindrical drum (3. A spring 2O secured to the arm 15 and engaging'with a hook 21 on the rod 18 holds this rod so that the arm 22 carriedat the other end ot the rod 18 is forced into engagement with a stop 23carried by the arm 1G. ln front of thel indicator is the 'face platehavingl an opening,` QG through which is normally seen the plate 27which would preferably be of the same colour as the 'tace plate so as tobe indistinctive. The operation is as tollows z-llhen a vibratorycurrent such as a buzzer current is passed through the windings of theexciting coil 4, the reed 5 is caused to vibrate in 'the well knowninanner, due to its varying polarity and thereby causes the cord 5 tovibrate sinfiilarly. lt is found that with a suitable adjustment ol thespring 9 the pivoted cylindrical member 6 will rotate, duel it isbeliei'fed, to the cord 5 exertingT a greater frietional force along thesurface of theI member (3 when moving awa)Y from the member, than whenmoving towards it. The member 6 therefore rotates in a clockwisedirection and thereby causes the member 19 which is pressing' against itdue to the weight oi the arms 15 and 16 and Jthe plate 1T, to rotatealso. After a short movement, the cylindrical member 6 no longersupports the member 19, whereupon the plate 17 falls in front of? theplate 27, this plate 17 bein ot a distinctive colour serves to give avisual indication. In addition, in a simple bushing' in the base plateslides a contact rod 29 which is depressed by the bar itl when falling,to cause the. contact spring` 30 to engage with the contact sprinpl 31mountet 0n the plate 28 so that a circuit of a bell or other devicecould be closed, the indicator would then remain in the operated position until manually restored. rlihis is et fected in the followingmanners-At the rear end of the arm 15 is fitted a lever 32 having a faceplate 33 adapted to be engaged by a rod 34. This rod is controlled by aspring so that it normally remains in the position shown, but when apush button 36, mounted in front ot' the 'face plate 25 is pushed, therod 34 is moved to the lett. Now when the indicator is in the operatedposition, the face plate 33 would be in Contact with the end orn the rod34, consequently by pressing the button 36, the arm nf" and with it theindicator 17 is turned in an anti-clockwise direction about the pivotsE? and 88. The spring 20, as soon as the indicator is lifted far enoughabove the cylindrical member 6, causes the rod 1S to rot-ate clockwiseuntil the lever 22 engages with the stop 23. In this position, if thepush is released the member 19 will be in a position on the surface oitthe cylindrical member G where it can support the arms 17 whichtherefore remains in the normal position until fresh Vibratory currentsare received.

lt will be appreciated that in this manner, an indicator operated byvibratory currents has been evolved which will give an indication orcause the closure of an electric circuit igor an inde-finite period,adapted to be terminated by means independent of the vibratory current-sreceived. Such an indicator conld conveniently be used in connectionwith .Geld telephone sets in which buzzer calling' was used.

Referring to Figures 3 and 4, the reed 39 y 1"" operated similarly tothat described with reference to Figures 1 and 2, and is connected bymeans of a cord 40 round a. cylindrical drum 4l to a spring 42 adaptedto bo adjusted by inea-ns ot the milled head rod 4, the movablecylindrical member is pivoted on the screws 4.4 and and carries rings 46and 4.7 on its surface preferably of platinuni. Against these rings twolight llexible metallic springs 48 and 49, provided with platinumcontacts are adapted to press lightly: the particular pressure beingadjust-aldo by means of the screws 50 and 51. It is found that with acertain adjustment oi the screws 50 and 51, the electrical contactresistance between the Contact 4S and the ring 46 or the contact 49 andthe ring 47 while being practically zero under ordin nary conditions, isconsiderable when the cylindrical member 4l is rotatedn ln addition, thecylindrical member carries a wheel 52 provided with projections 53adapted to torce the spring` out-wards and release it so that it is treeto vibrate, Adjacent the springV 54 but normally out olf contact withit, is a spring 55 which is adjusted by means of a screw 56 so that thecontact member 54 is adapted to malte connection with it when set invibration due to being; released by means oit' one of the lll)projections 53 when the cylindrical member 41 is rotated.

The instrument shown in Figure il, is shown in plan view in Figure 3,where in addition is also shown aslow acting relay 57 of the type inwhich a copper ,slug 58 is provided adjacent to the armature 519, sothat the relay is slow to release, such relays are well known and neednot be described, There is also provided on the same base 60, aswitching device 61.

These instruments are conveniently located under a cover secured by abayonet. socket joint to the ring 62 in which, the cover being removed,the pins ot' the bayonet joint are visible at 63 and tiel. Outside thecover on the base 60, are litted 8 terminals, (55, G6, G7, (3S, 69, 70,71 and 72, to which may be connected devices as shown. To the terminals(5S) and 7() are connected the lines L and L2 over which high frequencybuzzer currents are to be received These terminals 69 and 70 arepermanently connected to the exciting` elliptical coil 73 which operatesthe reed 39. Normally the switching device 6l is in the position shownin the drawings, so that if buzzer currents are received, the reed 39 iscaused to vibrate, which thereby causes the movable cylinder 4l torotate. This causes the projections 53 to maintain the spring 5a in acontinual state of vibration. consequently a circuit is intermittentlyclosed as tollows:-positve pole ot battery G7, winding ot slow acting`relay 57, terminal 74, Contact spring` 55, contact spring` 5l, terminalT5, left hand contact: ot' switching` device 76, arm ot switching`device to terminal 77 and thence to cont-act (5S and negative pole otbattery. The slow acting;- relay is accordingly energized in thiscircuit and attracts its armature 59 which remains in the energizedpostiou as long as the contacts and are intermittently engaged, that isto say, substantially although not absolutely, in accordance with thevibrations received. vWhen the armature 59 is attracted, the circuitiscloscd through its contact 78 with the adjustable contact 79 ask'tolle-ws:- positive pole ol battery, terminal 65, terminal 30, armature59, contact 78, contact 79, terminal 8l, terminal G6, bell 82 tonegative pole ot battery. The bell theretore rings in substantialagreement with the viinations received. so that the attention theoperator may be called by the simple transmissionct buzzer currentscontrolled at willby the'calling'- party. The attendant would thenoperate the switching device (il, so that the terminal 63 was engaged inplace of the termin-al T8, then a circuit is closed asl tollows:positive pole oi battery terminal 67, terminal 7l, sounder' 84,terminalterminal 85, iexible spring 48,

deenergize for the same periods. In this way, the message transmitted incfode using` buzzer currents may be adapted to operate a sounder in theusual way. As soon as the messagey has been received, the switchingdevice would be replaced in its original position in readiness toranother call. Obviously, either the contact resistance device or thevibrating` contact could be used independently in conjunction with themovable member 4l, although as de` scribed, there are advantages incombining the two devices.

lt will also be appreciated, that by these aus it is possible to eti'ectthe operation ot a sounder by signals received having a highvtrelpiency, the sounder 84 operatingin strict accordance with theduration ot the signals transmitted over thelines L and L2. also, it ispossible to make a call, where it is: not essential that the devicesoperated, such as the bell, may be other than under the approximatecontrol of the calling;` party.

l claimze l. lrleans tor responding to vil'n'ations in direct accordancewith their duration, cornprisingi` in combination. a vibratory mem'-ber, a movable member -having a metallic surface, a tlexible metallicmember touching;` said metallic surface and a connection between saidvibratory member and said movable member whereby said movable meml'r-eris `given a movement relative to said tlexible member therebyimz'reasing;` the contact resistance between them.

S2. Means tor responding to vibrations in direct accordance with theirduration, comprising in combination. a vibratorimember, a movalileniember having a platinum surface. a liexiblc `metallic member haring aplatinum contact touching said platinum surface and a connection betweensaid vibratory memlgier and said movable member whereb).i said movablemember is given a movement relative to said flexible member therebyincreasing the contact rcsistance between them. i

3. Means for responding` to vibrations in direct accordance with theirduration, comprising in combination, a vibratory -mem ber, a movablemember having a metallic lll) surface, a flexible metallic membertouching said metallic surface, and a thread under tension connected tosaid vibratory member and pressing against said movable member wherebysaid vibratory member is adapted to exert a greater frictional forcealong the surface of the movable member when n'ioving in one directionthan when moving in the other, so that said movable member is given amovement relative to said flexible member thereby increasing the contactresistance between them.

4:. Means for responding to vibrations in direct accordance with theirduration, comprising in combination, a vibratory member, a movablemember having a platinum surface, a flexible metallic member having aplatinum contact touching said platinum surface and a thread undertension connected to said vibratory member and pressing against saidmovable member whereby said movable member is given a movement relativeto said flexible member thereby increasing the contact resistancebetween them.

5. Means for responding to vibrations in direct accordance with theirduration, comprising in combination, a vibratory member, a movablemember having a metallic surface, a flexible metallic member touchingsaid metallic surface, a circuit including a source of electrical energyand a detector in series with sai-d flexible metallic member and saidmetallic surface, and a connection between said vibratory member andsaid movable member whereby said movable member is given a movementrelative to said flexible member thereby increasing the contactresistance between them, so that the detector responds to thevibrations.

6. Means for responding to vibrations in direct accordance with theirduration, comprising in combination, a vibratory member, a movablemember having a metallic surface, a flexible metallic member touchingsaid metallic surface, a circuit including a source of direct currentand a detector in series with said flexible metallic member and saidmetallic surface. and a connection between said vibratory member andsaid movable member whereby said movable member is given a movementrelative to said flexible member thereby increasing the contactresistance between them, so that the detector responds to thevibrations.

7. Means for responding to vibrations in direct accordance with theirduration, comprising in combination, a vibratory member, a pivotalcylindrical member having a metallic surface, a flexible metallic membertouchingsaid metallic surface and a connection between said vibratorymember and said pivoted cylindrical member whereby said cylindricalmember is caused to rotate thereby increasing the contact resistancebetween the metallic members.

8. Means for responding to vibrations in direct accordance with theirduration, comprising in combination, a vibratory member, a pivotalcylindrical member having a metallic surface, a flexible metallic membertouching said metallic surface and a thread under tension connected tosaid vibratory member pressing against the surface of said pivotedcylindrical member Vwhereby said cylindrical member is caused to rotatethereby increasing the contact resistance between the metallic members.

9. Means for responding to vibrations in direct accordance with theirduration, comprising in combination, a vibratory member, a pivotedcylindrical member having a metallic surface, a 'flexible metallicmember touching said metallic surface, a circuitcincluding a source ofelectrical energy and a detector in series with said flexible metallicmember and said metallic surface, and a connection between saidvibratory member and said pivoted cylindrical member whereby saidcylindrical member is given a movement relative to said flexible memberthereby increasing the contact resistance between them, so that thedetector responds to the the vibrations.

10. Means for responding to vibrations in direct accordance with theirduration, comprising in combination, a vibratory member, a pivotedcylindrical member having a metallic surface, a flexible metallic membertouching said metallic surface, a circuit including a source ofelectrical energy and a sounder in series with said flexible metallicmember and said metallic surface, and a connection between saidvibratory member and said cylindrical member whereby said cylindricalmember is given a movement relative to said flexible member therebyincreasing the contact resistance between them, so that the sounderresponds to the vibrations.

1l. Means for responding to vibrations in direct accordance with theirduration, comprising in combination, a vibratory member, an electricalmember for causing said vibratory member to operate, a pivotedcylindrical member having a metallic surface, a flexible metallic membertouching said metallic surface, a circuit including a source ofelectrical energy and a detector in series with said flexible metallicmember and said metallic surface, and a connection between saidvibratory member and said cylindrical member whereby said cylindricalmember is given a movement relative to said. iiexible member therebyincreasing the contact resistance between them, so that the den tectorresponds to the vibrations.

12. Means for responding to vibrations in direct accordance with theirduration, comprising in combination, a reed, an electromagnet forcausing said reed to vibrate, a movable member having a metallicsurface, a flexible metallic member touching said metallic surface and aconnection between said reed and said movable member whereby saidmovable member is given a movement relative to said tlexible memberthereby increasing the contact resistance between them.

13. Means for responding to vibrations in approximate accordance withtheir duration, comprising' in combination, a vibratory member, arota-table member, a circuit closing device actuated by said rotatablemember when rotating, a slow acting relay controlled by said circuitclosing device, a connection between said vibratory member and saidrotatable member whereby said rotatable member is given sufficientmovement to effect the actuation ot said circuit closing device and theoperation of the slow acting relay in response to the vibrations ot thevibratory member.

14. Means for responding to vibrations in approximate accordance withtheir duration, comprising in combination, a vibratory member, arotatable member, contact springs actuated by said rotatable member whenrotating, a slow acting relay adapted to be excited when said contactsprings are operated, a connection between said vibratory member andsaid rotatable member whereby said rotatable member is given sut* cientmovement to effect the actuation of the contact springs and theoperation of the slow acting relay in response to the vibrations of thevibratory member.

15. Means for responding to vibrations in approximate accordance withtheir duration, comprising in combination, a vibratory member, a movablemember, a contact spring adapted to be set in vibration by said movablemember, a second contact spring normally separated Jfrom said first Ymentioned contact springs but adapted to be engaged by it when set invibration, a relay of the slow to release type adapted to be excitedwhen said second contact spring is engaged by said first contact springand to remain excited during said vibrations, a connection between saidvibratory member and said movable member whereby the movable member isgiven sutiicient movement to eii'ect the actuation of said irstmentioned Contact spring, and the operation of the slow acting relay inresponse to the vibrations of the vibratory member.

16, Means for responding to vibrations in approximate accordance withtheir duration, comprising in combination, a vibratory member, a movablemember, projections on said movable member, a contact spring adapted tobe set in vibration by the projections on said movable member, a secondcontact spring normally separated from said lirstinentioned contactspring but adapted to be engaged by it when set in vibration,

a relay of the slow to release type adapted to be excited when saidsecond contact spring' is engaged by said iirst contactspring and toremain excited during said vibrations, a connection between saidvibratory member and said movable member whereby said movable member isgiven suliicient movement to ei'lfect the actuation oit said firstmentioned contact spring, and the operation of the slow acting relay inresponse to the vibrations et the vibratory member.

17. in combination, a movable member, projections on said movablemember, a contact spring' adapted to be set in vibration by saidprojections, a second contact spring normally sepa ated Jfrom said irstmentioned contact spring but adapted to be engaged by it when set invibration and a relay of the slow to release type adapted to be excitedwhen said relay is set in vibration and to remain excited during saidvibra.- tion.

18. Means vfor responding to vibrations in approximate accordance withtheir duration, comprising in combination, a vibratory member, a movablemember, a circuit closing device actuated by said movable member, a slowacting relay controlled by said circuit closing device, a thread undertension connected to said vibratory member and pressing against saidmovable member whereby said movable member is given suiiicient movementto e'liieet the actuation oit' said circuit closing device and theoperation of the slow acting relay in response to the vibrations ot thevibratory member.

19. liileans tor responding to vibrations in approximate accordance withtheir duration, comprising in combination, a vibratory member, a movablemember, a circuit clos'- ing device actuated by said movable member, aslow acting relay controlled by said circuit closing device, asignalling device controlled by said slow acting relay, a thread undertension connected to said vibratory member and pressing against saidmovable member, whereby the movable member is given su'lticient movementto eiiect the actua tion of said circuit closing device and theoperation oi' the signalling device in approximate accordance with thevibrations et the vibratory member.

20. An electric relay device comprising in combination anelectromagnetic device responsive to intermittent vibratory currents, acircuit, means controlled by said device for causing variations ofcurrent in said circuit exactly corresponding in duration with thevariations ot current received by said device, a second circuit, asecond means controlled by said device tor causing variaations otcurrent in said second circuit which diiier considerably in durationfrom the variations ot current received by said device and switchingmeans adapted to llt) close one or other of said circuits withoutinterrupting the response of said electromagnetic device.

2l. An electric relay device comprising in combination a vibratorymember, an electromagnet for causing said vibratory member to vibrate, amovable member, connection between said vibratory member and saidmovable member whereby said movable member is given a continuousmovement, a circuit controlled by said movable member so as to have avaria-tions of current corresponding exactly to the movements of saidmovable member so as to have variations of current correspondingapproximately to the movement of said movable member, and switchingmeans adapted to close one or other of said circuits withoutinterrupting the response of said vibratory member.

22. An electrical relay device comprising in combination, a vibratorymember, an electromagnet for ycausing said vibratory member to vibrate,a movable member a connection between said vibratory member and saidmovable member whereby said movable member is given a continuousmovement, a metallic surface on said movable member, a fiexible metallicconductor touching said surface in such a ma-nner that the electricalContact resistance increases when in relative motion, a cir-cuit closingdevice controlled by said movable member, a slow acting relay controlledby said circuit closing` device and switching means for connectingeither the Variable contact or the circuit closing device into circuitwithout interrupting the response of said vibratory member.

23. An electrical relay device comprising in combination, a vibratorymember, an electromagnet for causing said vibratory member to vibrate, amovable member a connection between said vibratory member and saidmovable member, whereby said movable member is given a continuousmovement, a metallic surface on said movable member, a flexible metallicconductor touching said surface in such a manner that the electricalcontact resistance increases when in relative motion, a circuit closingdevice controlled by said movable member, a slow acting relay controlledby said circuit closing device, a detector controlled by the contactresistance between said metallic surface and said metallic conductor, asecond detector controlled by said slow acting relay and switching meansfor bringing either the iirst or second detector into action withoutinterrupting the response of said vibratory member.

24. An electrical relay device comprising` in -combination a vibratorymember, an electromagnet for causing said vibratory member to vibrate, amovable member, a connection between said vibratory member and saidmovable member whereby said movable member is given a continuousmovement, a metallic surface on said movable member, a flexible metallic`conductor touching said surface in such a manner that the electricalcontact resistance increases when in relative motion, a circuit closingdevice 4controlled by said movable member, a slow acting` relaycontrolled by said circuit, closing device, a sounder controlled by thecontact resistance between said metallic surface and said metallicconductor, a bell controlled by said slow acting relay and switchingmeans for` bringing either the bell or the sounder into circuitaccording as to whether' it is desired that the instrument shouldrespond to a call or to code messages energizing said electromagnet,without interrupting the response of said vibratory member.

25. Means for detecting' or utilizing minute vibrations, comprising incombination, a vibratory member, a movable member, a contact making andbreaking device associated with said movable member and a connectionbetween said vibratory member and said movable member, whereby A saidmovable member is adapted to exert a greater frictional force along thesurface of the movable member when moving in one direction than whenmoving in the other, so that the response of the vibratory member tominute vibrations, causes said movable member to move in one directiononly sufficient to effect the operation of said contact making device.

26. Means for detecting or utilizing minute vibrations comprising incombination, a vibratory member, subject to minute vibrations, a movablemember, an indicating device associated with said movable member, and aconnection between said vibratory member and said movable member wherebysaid movable member is adapted to exerta greater frictional force alongthe surface of the movable member when moving in one direction than whenmoving in thel other, so that the response of the vibratory member tominute vibrations causes said movable member to move in one directiononly sufficient to effect the operation of said indicating device.

27. Means for detecting or utilizing minute vibrations, comprising incomb-ination, a vibratory member, a movable member, a contact making andbreaking device associated with said movable member and a threadunder-tension connected to said vibratory member and pressing againstthe surface of said movable member, whereby said movable member isadapted to exert a greater frictional force along` the surface of themovable member when moving in one direction than when moving in theother so that the response of the vibratory member to minute vibrations,causes said movable member to move in one direction onlj,T suiiicient toeffect the operation of said contact making device.

28. Means for detecting or utilizing minute vibrations comprising' incombination, a vibratory member subject to minute vibrations, a movablemember, an indicating device associated with said movable member and athread under tension connected to said vibratory member and pressingagainst the surface of said movable member whereby said movable memberis adapted to exert a greater frictional force along the surface of themovable member when moving in one direction than when moving in theother, so that the response of the vibratory member to minute vibrationscauses said movable member to move in one direction only su'fficient toeffect the operation of said indieating device.

In testimony whereof I affix my signature in presence of tivo Witnesses.

SIDNFY REYNELL SMITH. Witnesses R. MERCER, T. H. BARNES.

